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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8335286be1e556993b70ee4777531807aef9c6f822a50e804608c0809db65a' 
  AND token = 'BnYr5zz9IG/ttIxbqx06xD5m0n8qTOhr5GmzYWwcxuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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