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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '504b5e5ce23029678b2ae3280719e27911e9065a3943956ff5b505bf2084af5a' 
  AND token = 'k6pn8IYWm5vB5+v1+YZ3CFGnF2p/czeQ2w9C9zX+Sq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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