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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b28fc8db75e072b92e4973a25d2e6cf3edc282d96f176a9b85c4f517ba79fa' 
  AND token = 'hHsraekGmGwFXx6lf9mTCq60pJVQfrFFSer/AYdqDGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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