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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a0f8ccf3fa71a01d8ea349ea88e88287f6b348e8977b7049226793009b2d7c' 
  AND token = 'J5rGhF8Ct187phfEPL4TEy0TkL7UXKggY8cKUxvqWcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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