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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136a65b42b34aaddc7aa27053792c23e351f60398f1ea3c5652c900279263503' 
  AND token = 'VPB/HJexp64vHT9BThrVyP8VFLi+RcSFA/dIFUVJny8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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