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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5a2bb05a6a906fc075e4a70500f779b75a3e35ae12d78b645b3b7c8f039cda4' 
  AND token = 'b/Cn9Y4YpY63Y3+Qn3MRT3fmFRn7ZOll65DBp8WvnpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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