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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb4f588b106ee5d950e2a42f1d82db8fe5d398fe6b9eb1c0574cc6fa014b41d' 
  AND token = 'ltB9TtiOrxG9NHzo/oziLTVJ0Wj/lh3328n6bPZ5854=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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