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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b15c41974d5a72c3f502d2566a6454df943471b7ec74dcaddc5c68e0055768ad' 
  AND token = '0JpOvGTJmFdqR5fHZZ6kaDi9sZA9yglDLiydB9jlPCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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