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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '476c8e0ea89fa57bd978bdc866621f6ee5e3436d264b53d372c288f9e6920fa5' 
  AND token = 'nnDqxyF5OULMs6b7al9AEgTg2aBV3n6tNQBWBvhLcAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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