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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dabea2e966375f9ee2ec193fa830fe6402cd60f877168cf392b270c9745678d3' 
  AND token = 'qSaoCpwEZhtw2twZlRiYmP1GekwlpcbN6IVCqYu/x5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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