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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ad976c1bed7ac58e79df705310f4b30a72cd76af91364c9f822f2b30521ed9' 
  AND token = '3x5CTGuO69y85CVvfIY6VnqD5o0LtLISVSh5Hb6gk4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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