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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf96eebe250b6b0752c329190d6587b5b17d4dc3634a3ba90723cca59c03ba94' 
  AND token = '0KlIR0q/17AYilOxfkW0GSl5VWvmocnaLystq/oTJ/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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