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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9fbe03fdb9e12ae03f78e2bf12e0cae927b1336c16ab3b9be0d653a3201baf' 
  AND token = 'WKOFO7jkJEqy3cXEDjt3PXlfMmGvNn1bSjuByYBBqBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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