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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e389d2aae00076e079add41abcdb6065ddbfe1b7bddfa69dbe69aa3cb5fc3e51' 
  AND token = 'zgNtL/yY4hSbz5fZQ0F5i47L7bFM7SmlbGxi4KXJCME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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