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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ea0391a4f97b55b5d80ffe22d8fc3afa3e77391211285bceeecb4002edfbfc' 
  AND token = '3nAU2JoU97vtOo8vfQ1BETowG6olG/P/x6ZlTWDjmWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}