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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9df5d0114782eeeee15654e1e6e831f25419ba0bb86a712cd720b5784e8c39' 
  AND token = 'JzljSaz7fXV39Nd+sn8JB+58MoBsfL0MbSvQ84AUjIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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