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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3472c4d38bcee94cce5b068ea0872ee9cde8f9caa55cec7a1b15fe5e7a3abd62' 
  AND token = '9RIJh9lk0LHH+oZJQJl0naQEz3b19+iQP1sQOf/eIjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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