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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c5cbbf338e9d20489b74f95095259652ef47a81635e35b600f8e6a02f65e0c6' 
  AND token = '0F78xVwdpUNdonO3Pvkx+o4E6g38V6b6tF/Le4ll7+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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