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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33542c9a0c2c68252af2007c77ab48142171eb9548fc22270f5eb7f2d11a41fa' 
  AND token = 'wHn7bkueWdImj1Ci/IFsLu2qXiGMIr5t/yzj1TocNMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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