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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '313d74b75210a8b2653099f4aa8b29704031991b20cd8db211f31678dbd876c9' 
  AND token = 'ALOq28muoZ92lfDQk1LVRN3ZLUgv6BWZ+LCWNyyeW8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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