SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9280ab3c318d85824f09f2e5d3a6e8375008088c31ec408d4ac5fb92d3d27f6c' 
  AND token = 'PwLiB4oAKwqzZFV9bv+hW/HPWkDyutcT6H11m+RX+fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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