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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '491a492ae9c7ba73f36a99fb21d8cc69270c60ce0c7903a7271599b6406807e6' 
  AND token = 'V+7j+vuATGXcBBOQctLZRKyudSG7GUqhebOUeS9XCtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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