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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '174c4f9898f497873ad1b49760bad8f7095828742fbfd217bc92d91822d33933' 
  AND token = '5iHzWzNDz/t+VmLp5eCmwGxUn5Oe/7l29Abmvy29i/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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