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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdcde99b4772bfbf00f368f4ba8fe010039cc2e535d2b673248c81d33e335047' 
  AND token = '9ESxXvZ12gQFoMgdPwyKR7QFfcpsFN+jRNixgTDI4U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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