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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b17202237f32dabb1e8442603e569dd777888c7d92b117b56750ccdcd21a5b' 
  AND token = 'zu2KFypLH2kyRqi5uj4qhvvneVMl7sW6JTdU9Rek7n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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