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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41a70760b515d34df32f7607996eb51041f7e4ad7bd725abbae3c286213d0a8c' 
  AND token = 'Z7eg+3shhx9ivhyi63MPz2W7lwdaZb4oDQHDpMroz4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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