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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69991bcccfd7fe13238a8d624a0a0e0783d021f50d8237caf48f04e2c3b34d63' 
  AND token = 'o34YvpGOf3oV4nMKVXS8xRVs8inCKov93yDCPnjNdfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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