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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6270b82b0e56ce473c9dabc4e8729121fdc03814162cc13752e51b02851381b' 
  AND token = 'g8MRMormvqSKBsNBw0XITgXSBeu0cBFi5YILw/VgIsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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