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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66f8876e4ccc6f91d794178f97696ecc13fe8127f8ef2951bf977df0b3ccd37b' 
  AND token = '+4llP3i67ipfC5BN9IlA1s4+DwmfRGmm+k8qP8HXV1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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