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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9670315680e772ecae62365bef6c9301adbd5f7cea7cf8d2f245fed6c10503e9' 
  AND token = '1UdF1LN9kWonrah2CtMMfrKpCBHyPRE3R9Zy1pQrDI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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