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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ca890aeccdc36ea979ee607ff7e4239addb2792b53789c31feed5bb220b25ea' 
  AND token = 'nA5WONTNEQreGb/B4h1d582YkZWUFiw11EY7RX/a4dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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