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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6823007c766ce8a317d11d45a055219ce7e6d40a11ad880ea456aa81980f8b22' 
  AND token = '98ZWujkujofQSl8Ey+MNxyWNqrPInRV05AwejVnOv4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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