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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52b84b2a6ebcf61bfa4bb177c31fc289baddacb249e5c72029ba1a9e02975303' 
  AND token = 'cTk5YVmDG/hKw1/whh2/c3asYXPG/uBOYo0EkyUple0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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