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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17683f45084033174e7c21512f39f6d47ad0843b8b564a326016059cfb0d84ed' 
  AND token = 'G2xz8GX6Tsa5je56rzWnm9K8uyGHKWRkXa2YKwQV1dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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