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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76949f6f49a1eb33b8fba652b719aff36a2b70d60cd2cd0a460a01a91a6903e' 
  AND token = 'C004OQ2MXWXaUT5euyUlEcb/geS+WJte9qL8KmvDwns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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