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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eeb259c57c9d9b99d15ffcc52bba8de5c182b5bf27c501ce6dea392f3dcd31d' 
  AND token = 'bv+OL7+4lowIoJ4or4I307GMsZr+oSO+uNe0gx04Z98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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