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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20445731636fa30082fa4909d689a5389e49c1a5af078458a8bfbc61a19de20e' 
  AND token = 'NbEAMeEzUeTYfUrpzWhiorUhsx0kA9QhwSNTDqf6DvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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