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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e0cf07cf54ecfff972cf302ee14aac780c380a88426bf4527970e99dfd9dd99' 
  AND token = '9pxvQtz7/cH3NW7aEM6IMsa6NDVE0YWHEqOuqWzBf1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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