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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a1a699a8fb74c70bdd8de6f9d87169181a942c079655c6d8bbd3a9b78849c25' 
  AND token = '0Axgl0dWwRndeIbdrGbInbHvhBAbI1hhmVItzk54zPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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