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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b13fe9e61673ac71ba061fef2e7f05a6e41570d64080f3bc79268573cdfa5b20' 
  AND token = 'UOQzIVfmwdAXrh5EzbZ919zQjd0HJABz7WSV5zj3hIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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