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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edbb1d96ba956dfeebacb78848dec565024ddab6edc7f9e07033f0468501bb4f' 
  AND token = 'clBccMM95IwoEGF/Vb480//qT2Ld9tAkD6moir3RZrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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