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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f32b8557be99eec8eb1ac8b3d049f5823d4b93b05205674e991d75fb45c4bad' 
  AND token = '0yGpPGBSRbRnbHoDbzCaCTLOvBdApl44ErZJ4Mw090w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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