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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b296c093ba8c1f1c08f2d317656c2297705eaa90753c1a019ae2feb11b83267f' 
  AND token = 'cqfKuxacyXq98cV7f3Dj+Gie7Dwr7iCrx22j+c45ys8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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