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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '416b1ec2f7015c6f58d4b8c937996b1bffc4246bf5f2c6e1b7d9ee7e391cf7a3' 
  AND token = '+NHmwvFC4WS52q1NLkx/76utqgKQWq/JxsLT7bh/yqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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