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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de2780cb74f2bdee65ae87c695b80bd5a4a8d0756a587cf7982eb87b2acb903' 
  AND token = 'W3S6zzS3E/RLQzHx2CDf0kob9G/nee9GVappNXXBKGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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