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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c99cbd33208d4103c09cae8d40baca51b4cf4b250bdf074c764f0dd215efb27e' 
  AND token = '7vAu8j/tGVFttRZEpO4+N3oW+J2Tr9VbFXP2F4RQcLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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