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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '589e0142481f0bbb993215c125336bfbcf2fab42a3c56e8e1591ae7e85737dce' 
  AND token = '3mQRt7YB1v6xLPjEf8jFW4BDmlev00ix4bzPXdh16gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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