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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec3ef42e2756537742c4aa14b8d5d5d289beee438de0ae59334095d296c7359' 
  AND token = 'cSpPswdZJCC8DKV0Iiud6b+7Z+D5Ixj2uQg3u0S28nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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