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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ecb563529393b6898eba958c93c5c00a78884ee714f4832651c3c740753631' 
  AND token = '5cstKA1gzllonKuQpLIZLvizZV15Vm6KcEtv7aZdP4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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