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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f212d6dc8cc9f6f7e3d62a6a6d34ba3cc0ab3a5ab5b4eddb4cd6362daca5bf5' 
  AND token = '9Fq4Py9kZa0WAaBK2N6ewPZP3u+BmmEa25BTuP/gFoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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