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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc35c3e88e47ec93d5bb7e02ad45c8e5475ac369a078527ab83b43d7c7ba136' 
  AND token = '0N+/Btkc90CXyXfMniwEs+QquYPifQENVDeHqcK/HbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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