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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e446eda56861f50f1ec3b9c7b9bea53b3e59810971b9ee9466d114502f148da' 
  AND token = 'fHs5AFoNvXMeIIswNvY7tmlJF95gVtEwNQB0R07rROM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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