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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ec8a89090702d3e250d52150067eb5a5093029a58c3b2693ed84c02e62e2b1' 
  AND token = 'wMeQVGoRo2r9+cqja+uOGNaaSt04yYwOE5ZtuYHwyZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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