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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd08634b261df74b845d37369d133ab7ccf8684f42596c576757cb6949f90eec8' 
  AND token = 'eCI2SG030Ifr3vs5CtNyA8vFhI9hboCGBltTTE6IrUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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