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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27065e6845b7237dc7ef21082d28f2c292025c4b26a56fd3df9a27f973a9d294' 
  AND token = 'L7rXkjrmKb6c0SQlK33yq9O66To81qDZsDSshI5qx7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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