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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c525cdc1f5b4302599b62cb4141515cab203dd5cd3655892370a45b6b2ca188f' 
  AND token = 'E96i+3LZ8K0M2KYAgcgqksJNfxToh/OlSBqx5saNT+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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