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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d35ca90ff41f2ae382a3ce6a375dfa0cc6082a4c40f301ed73086393d0f7997' 
  AND token = '0U+ohr7g2FJXFoiOwJQajlc9bFhvih0X38kq0TjOrAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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