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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '099a1e2673ab879674d8344bdd15e7edb963a388bbaf02b0a9d0c0c10942a98e' 
  AND token = '6MIHqqKkuNwFgV3UxbIoriwSFbIxhAxVGb0Z4KvnorI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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