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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23cce9055d0d1941e0c012068022afeb708f6f0d4b2db7526b236246bf9f81ee' 
  AND token = 'W5GxVwA8GFEbSyPk8QM9wCUuAw1uK6aChfO+tXt+Ryo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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