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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47049237672a0444195ecc95724ca04b8a76d996b7ea32025522859a65a5f81d' 
  AND token = 'PQkiMzPCJAgbXqDcIG/2nOyv5ZEwTHYa5DuV9ftyf9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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