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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faed76acb22dd73027a37ce3a5f1280d3c56b3167c8cd608895ce47efe028c8c' 
  AND token = '7F8LbXjlfj9jtX00z0rx8rym4bVSBe7s5Y6MEqbLwAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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