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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cae1d135d13031d934955afcef536ea6e0f4f3f5e175eebf22607a9249ca9d5' 
  AND token = 'vmeyseV0u3A7qKMnlJOeprEo90jJS1t8XviaoQPva+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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