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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '324003775c17327caaf0340a08370510ff93a9d67d4a0490bf0b9d7677a43e77' 
  AND token = 'y8VFNW87r8gb1jkrVSAMrMlx1x7Hmux0VTE7jiNDV/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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