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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71cda2f0baebff0c98ae33ad78b6545ce2325eff9c4c2fed67ea5030c2809dcd' 
  AND token = '9YtcVLAe0GrSxgZjMUExYvrRwNyoqrIfM/TnflD22r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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