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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c57c72430cdfac0a1fa379ed19eb4a6e637c04b7006504c7245e1124a2a9b53' 
  AND token = '9zDx4mIP08Nyo7fXkJ1IoUnpgpewdkHG5kGVuUXTizs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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