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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9911567b7903a9d696454402a63acd64674b0e077c94f6472d58e2e87d65ff47' 
  AND token = '8WKs9qy/VJhfHsYK4ECv3U1oTcxF1UjtcJfHm4fYkC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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