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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '057a3026e18fd9e251f0deb0a6d605710dc9d8ce37fc4f9d364a385179264383' 
  AND token = '6LZrU+TDuAY6cMAvKk+Rx6KzNeahNRvVz982PEA/Cq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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