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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1433b9b4ca799047f6de5184ac5a753f60bcd69b75b9af3b0f150dbd251b3593' 
  AND token = 'bvGs6JXmQC4r39fRUHFvQOMpx7vl2NXSFwCNEsNRg10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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