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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb36e1a5951e46ad21df871d2444b6f44207f81546a2891be897c4522564a304' 
  AND token = 'J58bo6p3zCfe1pEa4MM0rcAd6qhF/Sfm3/MaviXUrbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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