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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ae4b55e4138e59a8d5805c304533be5234e01d9c8b5b5b19aa7ff3bf3ccb38' 
  AND token = '9m2Hs4KjTqq4cR5+wFZK+ni5huMKs+Ls5dZ0TBWgWjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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